Sound blaster e1 is a portable and powerful headphone amplifier with support for studio quality 600 ohm headphones audio playback and two headphone jacks for easy music sharing with your friends tired of having to choose specific headphones impedances to match your setup the sound blaster e1 supports headphones with impedances of up to 600 ohms this means you can match just about any headphones with it enjoy a level of audio detail resolution previously unreachable sound blaster e1